Those Ming Dynasty swords in the Spring and Autumn and Warring States periods were basically bronze swords. When the Terracotta Warriors and Horses of Qin Shihuang were unearthed, a large number of bronze swords appeared. The sword body was bright and smooth, the blade was finely polished and extremely sharp.
These bronze swords are of fine workmanship and cut iron like clay. Once discovered, they immediately spread throughout the country. Even more miracles are yet to come. After testing by scientific researchers, they found that there is a layer of chromium salt compound on the front of the sword. This is a phenomenon that has not existed for thousands of years. Because of rust.
This discovery immediately caused a sensation in the world, because this chromium salt oxidation treatment method is a modern advanced technology. It was invented and patented by Germany in 1937 and the United States in 1950. As we all know, chromium is a rare metal. , with a melting point as high as 4000 degrees Celsius, making it extremely difficult to extract. It is surprising that China had mastered this technology more than 2,000 years ago.
While excavating and cleaning Pit No. 1 of Qin Shihuang’s Mausoleum, archaeologists found that a bronze sword was bent by a pottery figurine weighing 150 kilograms. The bending degree exceeded 45 degrees. When people moved away After the pottery figurines were removed, an astonishing miracle occurred. The narrow and thin bronze sword rebounded straight in an instant and recovered naturally.
To investigate the reasons, archaeologists have summarized the following points. First of all, the Qin Mausoleum itself is an unsolved mystery. It is said to be full of mercury, and bronze is a very special material. In addition, The tombs at that time were very dry, so they remained sharp and rust-free.
Secondly, the sword-making technology at that time was extremely high, and excellent materials were selected for forging swords. When they were buried, these swords also underwent special drying and chrome plating processes.